package com.shujia;

import java.util.HashMap;
import java.util.Hashtable;

public class Test {
    public static void main(String[] args) {

        HashMap<String, Integer> map = new HashMap<>();
        map.put("a", 1);
        map.put("b", 2);
        map.put("c", 3);


        Hashtable<String, Integer> hashtable = new Hashtable<>();


    }
}
